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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee304378992cbcc69462ea8797d52a90fd60b03f472736a5e724a0b8e532f87f' 
  AND token = 'uOL6y/bkdZiSeI3mM4BbgtYjHVPKmUOmsNiyoQE/0R8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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