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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6a120f9f890c1aa10814bcb3252256f0bb3b62bdffe74b56e5d8b26cc51bc378' 
  AND token = '5W/PX8tu5GZD1kwI0L8VhU1sNpaUeYt992tXnvpQVd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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