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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27c5bc7fd69838f4445f562d9a1156577f5e52e294254f7d1fa6317786879a16' 
  AND token = 'PpP9JjXK2iwbFn2yg60eTU4AfalPuIQJ7qdKJ1cSnFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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