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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bd7abb767e9d748d3a1e2ea34fa9921816b6db842c628c00b57371d087aa7f58' 
  AND token = '/UDRWSNfyDsndUM4IaTkW/w9HTPzUmH3jEx7kK7OeXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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