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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0e7c9137d7e45103915ec22cca8f82407c2f43ec6a40f4b890f721a231d3f85d' 
  AND token = '5pttXh2Oxo/NU7gAyQW9aaBrALSYK3Kztnpcj4cf/Zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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