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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a25158056f4cd06e91f2f92675ea0e1b3ec52da2cdef5f6cad54bf1e694dbb40' 
  AND token = 'x1wTkDTL8B/nlkz6PB5HhrvAFKd0k79VvRw5M6P8Z18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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