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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '68efaa26f15435bc859e835b1ccc9a60c3b987d8ae6de57e37274c92c9c520a1' 
  AND token = 'ecM77nwhv8isCSLO/uPtr3ZddCxAfH9tEtzbfk36n/s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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