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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '09300e7db8b7cbeb128eefeec9c663b89bf82842b4746d1a864b16e684b2fa5d' 
  AND token = 'u6VTm9/sdX/ER3LUQN+QCu5X+KFT4mkSnyg2QZ4WDHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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