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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cdc4e244bbca233b9f2a6dca0ce46f3c1a4f4eb2354f39e57af1be0f259eb4e0' 
  AND token = '5p1ICtt1cvMrGuer4vxlnYVJUStf+IPSGSV7G2ZbfDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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