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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd0dcbf6f4784505c74fbc4b76e584ec262bd05e5f6435442a2663733a5580b25' 
  AND token = 'KfuFQ1RUVbNLy9Gq1Hie6zjlQRK60MXjw3cgQYkTKyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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