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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '628b6f1fbc06720fc10b1ab6650a388d3b4ba141fee919111b5069fdc4477dd2' 
  AND token = 's28UGDOVRhJp1+/WNA5NHAeZei4EnkEXpVIz67uNL5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}