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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86420f314e0d788c97cb38f6b24ad227bd5eb044b1dc85252d0c0f06f6a35eb2' 
  AND token = '/LNC40TMR6V7S72lXJktd0s+yDHygI7PBTH+u3ALZ5Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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