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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd5f9b161ccd0e4d7c4e0787656bd11d8a9e9ad53338009737a1ba03d7d982b25' 
  AND token = 'aJLCtyc0Vn0WArB3x5vCE5SnwHT2EP1lIVxggiBKeqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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