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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '92ce389837adde6641549f66b350365c90e9e2baf1d3a8441e2a2c0e4fd763bc' 
  AND token = 'i6fsWr7LFnvu6hJGVegQ6Cyy+sf62qfQaM1APiFRUNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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