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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd96822e4132d2acb83a6bbf7b9f336f8dd3310b07d4cee4b8de1c23e72e28912' 
  AND token = 'x2jyrBeM3G0xqveKTmrM2u6ITpqhMeSJuv6CBrWgc6Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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