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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ef1d9ff2cad876d45817b1acc7f269b141b9a715ca76e74af08eae77cc52138a' 
  AND token = 'iD9VMmOqncNtSCNciiEKglu0xSzKQFu4TeFENkj9l7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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