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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '27b1f775c8a4ca77a39ce956055efedc3e58affed0d1a03be1e6668ca06c0c84' 
  AND token = 'MKNuFBJGyXlHt+XmSKHK/KxmrXNtvWD+Pl8lV+014Mw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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