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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0c6cb8d00bf5553e81b5a1248feaf4d30430df6e9fcfba0234e36459e1258b0e' 
  AND token = 'hEvi4yRjdq0L4VNfVOmYqJIFRP1f3leD/q676VNPbzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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