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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a744c25c8cac4f029a429487875ec5ffe6fbae27d31d74470c6ff4ea7d58b296' 
  AND token = 'Aa48aHdpzf8TgQlVPyy4mgGhCa15LGlmzWwH51lgM88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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