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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9ce3f3fb1e77045d1cba147b86816c0aa8bfe1800565130df16e5980efd69369' 
  AND token = 'Qc/vP/RIc73MCoDZ2r8Qn8BQGdn/mSPQRITIvYuALwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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