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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8054391df601691ca1fb345dce4348f73597733ed6bee5d793ce27c3e5c2c4a6' 
  AND token = 'M1lCigjQAFXcf2PjmWduD+zgJLyRMC4vPu1Oz6tFrfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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