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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '943d90b4bed3975f30f8f86ba0e7aef4859a50cfde531a5e9947205ca35079d5' 
  AND token = 'WpwjiYilRimus2O2i66DsjW6pr9FpPCJK5+S/4XbwJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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