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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eefe0bdf285a900895539ad771d384df2ee83bcb7007a8e161f5a6d30844dfb' 
  AND token = 'dIb3rQJJN7bVSp7tn/dKJm2b++/6Pw3otSzX2Rk3Xyg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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