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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd3fc1766cc8d19b9aba1cf11cafddce414a101ed5320c399ef7692c39b2e4649' 
  AND token = 'qXOBOf14dhpQoqul6CRZ7bpjys7xLVcskCikEgM71w8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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