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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '86483c78e74ba017b111b40a93aad17c2b4e34f5c715d01b8faa0c9196bac2d3' 
  AND token = '2HC9yhrVq+y2EgF2a4dUJPl3CRRMqOY14g4UPbdS3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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