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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fc40918c45100e3cbfc106ffdccca49d882aa8f4c6c109d735df60b91b0b349' 
  AND token = 'oKmJoom+xl9dPPg4S8jyXca18cq0gvMwfPUbskqfwYY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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