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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f2a58dfb49e24a688c052a47a15e9af8d859a4d22d2eee6cab49e3f0099f5e52' 
  AND token = 'OC4jgCdL1QhZSjA+7n2Y3BaTaiCTzADx2ROybD2vssc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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