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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6818705faef0d82fbb3534098165388a0f3bfab8c1945b842e12c24ba3bed282' 
  AND token = 'h4ChsxMRFLdbLwFvne1HXIjQFNBVXMY3k4Knt6Qc3E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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