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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0316bf79e7b7d9cb2cb5ce19e4f8e6e4a2eb57fc4f2cecbd876c477036fa4dea' 
  AND token = 'Q906mIRyu4BpfFv+q7g+NbrpY5ZgVIHwS7oLEFI5CHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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