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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8c1a483585ee56e63c235f5d860a2be1bf0965da112679191c4beae3b8708e6' 
  AND token = 'Jx4X9YjN1ud35wTWiuHYjt+0Mb3m6+DrVhu08Eud5BU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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