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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8af69113d0634b7148203afa9c6656a28206139c7061bc94c03fb87e20cb55a8' 
  AND token = 'iStpN5+Tkm10B0H91npHiJYJblA3jFoZtXyfxOPelLw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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