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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6cec3011fbd155dcd6f8c35ca945159c86bbfb1d55a607b1a1baf15f35e8cee5' 
  AND token = 'NOVHjL9R7R2XJYQF1Pdw9S/t9jdOlfyaBx0u3zR964M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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