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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'afe53fa91860821c05553f12c8a2a05f3c18c5db7582e7bc76330610ebda3f92' 
  AND token = '+/Hdi7qc48nhedSMh4+n1+Bpoqg0OhVXhYTdiwxDhaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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