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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b87b58088d5c95fad60dc6dfe2c6aa61bbee99f5e25626138a34f1825494664d' 
  AND token = 'ECegII9Ihv6OTruPuc/EToIDL3RHgqeR6GagO6mlAvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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