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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ea98a67ecd0a02f7e922a5a2d617c7bc1b3cc20c6c10a064a9a380c75b1c7909' 
  AND token = 'WiI4VjzJM24whuPsLeUEkol82bYeRdA4H3QqWwO+tXA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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