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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7cac0b906c4d17a9e064e37714ed90ce396a2f84bc7d6b1cd8bde6e567109631' 
  AND token = '1DiS4GFCJFiXwwUT2CMw03c4FwYFMmL5Sa/sjDFcLHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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