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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8a86452d8945e1d22abfd45966f84af087bcd4b6442c166e9dd4e99a4044d8a3' 
  AND token = '2DyWqQMV5cuWH7B2DzRQT30sIEsknlVcgv1VqeoynM0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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