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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0c8a68332a0073beb4e8c0615d2ef722642e718b31328ce8208a7cabfdd7908' 
  AND token = 'aZ1CEc5vWaebBRMpoAGs1jp8biWri36b+hEttnyxXT8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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