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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '2ec30c310461cf69011bbb4b1ba9cc613a2a416ac0f06e47ee5b8c7e3636a775' 
  AND token = 'calhr7tz2su/GSLKPLggJyDX1X9ncJOzFEoj+XfO29I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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