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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a494a3037fc7cdbcebcb2b35f2b23f93bb38faebc6d208ad6e380f7660f0cb87' 
  AND token = 'RSJBT/Ni+z3JqarlXgy4cnW6N6Rl7A7QFuwajd/P9dE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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