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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc6f644d830ee8104e8b71ee2b8ab82368134a28de933b77ac038ef04fc02035' 
  AND token = '5RHc+02m4ysmyJ853c/jn/z/2ggUKjHBKsOTuYNa6Nc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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