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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'e8bb23227c2772501ee7f1cb6c6aaa53d235bf641681cee5f34973e4e2ea8eb8' 
  AND token = 'nD7a54A1L4CMgR/moLUbbdwfZNoZyvJqWKsogkrxwnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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